Just had these codes read. po171,po174,po102,po112 po400,po1254.can any of you good people advise me on where to start thanks.
regards Rich

 

For o you mean 0

Just look 'em up except for the P1254 they're generic i.e. standard.

But you can do better if you grab the codes PDF from the stickies or get JTIS, both free. They even have the causes and P1254.

You may have an air leak so look at fuel trims with OBD live data.

 

When I get that many codes, I clear them and start over.